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The usable framebuffer excludes GSP carveouts and other protected regions so may differ in size from BAR size and total physical VRAM. Signed-off-by: Alistair Popple --- Changes since v3: - Partially new for v4 - previously this used GETPARAM --- drivers/gpu/drm/nova/file.rs | 1 + drivers/gpu/nova-core/api.rs | 5 +++++ drivers/gpu/nova-core/gpu.rs | 6 ++---- drivers/gpu/nova-core/gsp/commands.rs | 8 ++++++++ include/uapi/drm/nova_drm.h | 6 ++++++ 5 files changed, 22 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/nova/file.rs b/drivers/gpu/drm/nova/file.rs index 97688edd07af..cbe45d022ac6 100644 --- a/drivers/gpu/drm/nova/file.rs +++ b/drivers/gpu/drm/nova/file.rs @@ -92,6 +92,7 @@ pub(crate) fn gpu_info( gpu_info.size = size_of::() as u64; gpu_info.chipid = reg_data.api.chipset() as u32; + gpu_info.vram_size = reg_data.api.vram_size(); Ok(0) } diff --git a/drivers/gpu/nova-core/api.rs b/drivers/gpu/nova-core/api.rs index 09da0b4e9103..f025df90dc5d 100644 --- a/drivers/gpu/nova-core/api.rs +++ b/drivers/gpu/nova-core/api.rs @@ -33,4 +33,9 @@ pub fn of(adev: &auxiliary::Device) -> Result>> { pub fn chipset(&self) -> Chipset { self.gpu.spec.chipset } + + /// Returns the total usable VRAM size of this GPU in bytes. + pub fn vram_size(&self) -> u64 { + self.gpu.gsp_static_info.vram_size() + } } diff --git a/drivers/gpu/nova-core/gpu.rs b/drivers/gpu/nova-core/gpu.rs index 34a496ec3b38..7a2037105d29 100644 --- a/drivers/gpu/nova-core/gpu.rs +++ b/drivers/gpu/nova-core/gpu.rs @@ -283,7 +283,7 @@ struct GspResources<'gpu> { pub(crate) struct Gpu<'gpu> { pub(crate) spec: Spec, /// Static GPU information as provided by the GSP. - gsp_static_info: GetGspStaticInfoReply, + pub(crate) gsp_static_info: GetGspStaticInfoReply, /// GSP and its resources. #[pin] gsp_resources: GspResources<'gpu>, @@ -400,9 +400,7 @@ pub(crate) fn new( dev_dbg!( dev, "Total usable VRAM: {} MiB\n", - info.usable_fb_regions.iter().fold(0u64, |res, region| res - .saturating_add(region.end - region.start)) - / u64::SZ_1M + info.vram_size() / u64::SZ_1M ); } diff --git a/drivers/gpu/nova-core/gsp/commands.rs b/drivers/gpu/nova-core/gsp/commands.rs index 08380de39048..49ff3f5edcec 100644 --- a/drivers/gpu/nova-core/gsp/commands.rs +++ b/drivers/gpu/nova-core/gsp/commands.rs @@ -252,6 +252,14 @@ pub(crate) fn gpu_name(&self) -> core::result::Result<&str, GpuNameError> { .to_str() .map_err(GpuNameError::InvalidUtf8) } + + /// Returns the total usable VRAM size in bytes, i.e. the summed lengths of all usable FB + /// regions. + pub(crate) fn vram_size(&self) -> u64 { + self.usable_fb_regions.iter().fold(0, |size, region| { + size.saturating_add(region.end - region.start) + }) + } } pub(crate) use fw::commands::PowerStateLevel; diff --git a/include/uapi/drm/nova_drm.h b/include/uapi/drm/nova_drm.h index 2604e4d2698b..e315556dac26 100644 --- a/include/uapi/drm/nova_drm.h +++ b/include/uapi/drm/nova_drm.h @@ -140,6 +140,12 @@ struct drm_nova_gpu_info { * @pad: 32 bit padding, must be 0. */ __u32 pad; + + /** + * @vram_size: Amount of usable FB, excluding GSP carveouts and protected + * regions. + */ + __u64 vram_size; }; #define DRM_NOVA_GETPARAM 0x00 -- 2.54.0